package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import jdk.nashorn.api.scripting.ScriptUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            //计算日期，计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据，营业额为已完成的订单数据合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //select
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);

        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin,LocalDate end){

        //begin 到 end 每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //新增
        List<Integer>  newUserList = new ArrayList<>();

        //总
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);

            Map map = new HashMap();

            map.put("end",endTime);
            //总
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin",beginTime);
            //新
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        //封装结果数据
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO  getOrdersStatistics(LocalDate begin,LocalDate end){
        //begin 到 end 每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //每天订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //每天有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历datelist 查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            //查询每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime,endTime,null);

            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime,endTime,Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);

        }

        //时间区间内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //时间区间内的有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }


    /**
     * 根据条件统计订单数
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer  getOrderCount(LocalDateTime begin,LocalDateTime end,Integer status){

        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);

        return orderMapper.countByMap(map);
    }


    /**
     * 指定时间内的销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {

        LocalDateTime beginTime = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime,endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names,",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers,",");

        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        // 查询数据库，获取营业数据 30天
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        // 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(
                LocalDateTime.of(dateBegin, LocalTime.MIN),
                LocalDateTime.of(dateEnd, LocalTime.MAX));

        // 通过POI将数据写入到Excel中
        InputStream in = null;
        try {
            // 获取模板文件
            in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

            // 检查模板文件是否存在
            if (in == null) {
                log.error("找不到运营数据报表模板文件");
                throw new RuntimeException("模板文件不存在");
            }

            // 基于模板创建一个新的Excel
            XSSFWorkbook excel = new XSSFWorkbook(in);

            // 获取sheet
            XSSFSheet sheet = excel.getSheet("Sheet1");

            // 填充时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            // 获取第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            // 获取第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            // 填充明细数据
            LocalDate currentDate = dateBegin;
            for (int i = 0; i < 30 && !currentDate.isAfter(dateEnd); i++) {
                // 查询某一天营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(
                        LocalDateTime.of(currentDate, LocalTime.MIN),
                        LocalDateTime.of(currentDate, LocalTime.MAX));

                // 获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(currentDate.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());

                // 日期加1
                currentDate = currentDate.plusDays(1);
            }

            // 设置响应头信息
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            response.setHeader("Content-Disposition", "attachment;filename=business_data_report.xlsx");

            // 通过输出流将Excel文件下载到客户端
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            // 关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            log.error("导出运营数据Excel文件失败: {}", e.getMessage());
            throw new RuntimeException("导出Excel文件失败", e);
        } finally {
            // 确保输入流被关闭
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    log.error("关闭输入流失败", e);
                }
            }
        }
    }
}
